I think the main problem is that lots of people who have heard the "try it once and get hooked" story realize that they did try it once without problems, and therefore assume that addiction won't be a problem. From once to a few times to regular use to addiction is a slippery slope that most avoids, but for some it can take several years. But none of them started it with the assumption that they themselves would get addicted, and along the way made up many rationalizations for their drug use. So in that way, this anecdote is interesting.